package cn.edu.xmu.wnw.dao.impl;

import java.util.List;

import org.hibernate.LockMode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import cn.edu.xmu.wnw.dao.DiscussionDAO;
import cn.edu.xmu.wnw.pojo.Discussion;

/**
 * A data access object (DAO) providing persistence and search support for
 * Discussion entities. Transaction control of the save(), update() and delete()
 * operations can directly support Spring container-managed transactions or they
 * can be augmented to handle user-managed Spring transactions. Each of these
 * methods provides additional information for how to configure it for the
 * desired type of transaction control.
 * 
 * @see cn.edu.xmu.wnw.pojo.Discussion
 * @author MyEclipse Persistence Tools
 */

public class DiscussionDAOImpl extends HibernateDaoSupport implements
		DiscussionDAO
{
	private static final Logger log = LoggerFactory
			.getLogger(DiscussionDAOImpl.class);
	// property constants
	public static final String CONTENT = "content";
	public static final String AUTHOR_USER_NAME = "authorUserName";

	public void initDao()
	{
		// do nothing
	}

	public void save(Discussion transientInstance)
	{
		log.debug("saving Discussion instance");
		try
		{
			getHibernateTemplate().save(transientInstance);
			log.debug("save successful");
		}
		catch (RuntimeException re)
		{
			log.error("save failed", re);
			throw re;
		}
	}

	public void delete(Discussion persistentInstance)
	{
		log.debug("deleting Discussion instance");
		try
		{
			getHibernateTemplate().delete(persistentInstance);
			log.debug("delete successful");
		}
		catch (RuntimeException re)
		{
			log.error("delete failed", re);
			throw re;
		}
	}

	public Discussion findById(java.lang.Integer id)
	{
		log.debug("getting Discussion instance with id: " + id);
		try
		{
			Discussion instance = (Discussion) getHibernateTemplate().get(
					"cn.edu.xmu.wnw.pojo.Discussion", id);
			return instance;
		}
		catch (RuntimeException re)
		{
			log.error("get failed", re);
			throw re;
		}
	}

	public List findByExample(Discussion instance)
	{
		log.debug("finding Discussion instance by example");
		try
		{
			List results = getHibernateTemplate().findByExample(instance);
			log.debug("find by example successful, result size: "
					+ results.size());
			return results;
		}
		catch (RuntimeException re)
		{
			log.error("find by example failed", re);
			throw re;
		}
	}

	public List findByProperty(String propertyName, Object value)
	{
		log.debug("finding Discussion instance with property: " + propertyName
				+ ", value: " + value);
		try
		{
			String queryString = "from Discussion as model where model."
					+ propertyName + "= ?";
			return getHibernateTemplate().find(queryString, value);
		}
		catch (RuntimeException re)
		{
			log.error("find by property name failed", re);
			throw re;
		}
	}

	public List findByContent(Object content)
	{
		return findByProperty(CONTENT, content);
	}

	public List findByAuthorUserName(Object authorUserName)
	{
		return findByProperty(AUTHOR_USER_NAME, authorUserName);
	}

	public List findAll()
	{
		log.debug("finding all Discussion instances");
		try
		{
			String queryString = "from Discussion";
			return getHibernateTemplate().find(queryString);
		}
		catch (RuntimeException re)
		{
			log.error("find all failed", re);
			throw re;
		}
	}

	public Discussion merge(Discussion detachedInstance)
	{
		log.debug("merging Discussion instance");
		try
		{
			Discussion result = (Discussion) getHibernateTemplate().merge(
					detachedInstance);
			log.debug("merge successful");
			return result;
		}
		catch (RuntimeException re)
		{
			log.error("merge failed", re);
			throw re;
		}
	}

	public void attachDirty(Discussion instance)
	{
		log.debug("attaching dirty Discussion instance");
		try
		{
			getHibernateTemplate().saveOrUpdate(instance);
			log.debug("attach successful");
		}
		catch (RuntimeException re)
		{
			log.error("attach failed", re);
			throw re;
		}
	}

	public void attachClean(Discussion instance)
	{
		log.debug("attaching clean Discussion instance");
		try
		{
			getHibernateTemplate().lock(instance, LockMode.NONE);
			log.debug("attach successful");
		}
		catch (RuntimeException re)
		{
			log.error("attach failed", re);
			throw re;
		}
	}

	public DiscussionDAOImpl getFromApplicationContext(ApplicationContext ctx)
	{
		return (DiscussionDAOImpl) ctx.getBean("DiscussionDAO");
	}
}